OpenWrt – Rev 1
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From dbe94a8daaa63ef81b7414f2a17bca8e36dd6daa Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jogo@openwrt.org>
Date: Fri, 20 Feb 2015 19:55:32 +0100
Subject: [PATCH 1/6] gpio: add a simple GPIO driver for bcm63xx
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
---
drivers/gpio/Kconfig | 8 +++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-bcm63xx.c | 135 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 131 insertions(+)
create mode 100644 drivers/gpio/gpio-bcm63xx.c
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -134,6 +134,13 @@ config GPIO_BCM_KONA
help
Turn on GPIO support for Broadcom "Kona" chips.
+config GPIO_BCM63XX
+ bool "Broadcom BCM63XX GPIO"
+ depends on MIPS || COMPILE_TEST
+ select GPIO_GENERIC
+ help
+ Turn on GPIO support for Broadcom BCM63XX xDSL chips.
+
config GPIO_BRCMSTB
tristate "BRCMSTB GPIO support"
default y if (ARCH_BRCMSTB || BMIPS_GENERIC)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o
obj-$(CONFIG_GPIO_ASPEED) += gpio-aspeed.o
obj-$(CONFIG_GPIO_AXP209) += gpio-axp209.o
obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
+obj-$(CONFIG_GPIO_BCM63XX) += gpio-bcm63xx.o
obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o
obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
obj-$(CONFIG_GPIO_CLPS711X) += gpio-clps711x.o
--- /dev/null
+++ b/drivers/gpio/gpio-bcm63xx.c
@@ -0,0 +1,135 @@
+/*
+ * Driver for BCM63XX memory-mapped GPIO controllers, based on
+ * Generic driver for memory-mapped GPIO controllers.
+ *
+ * Copyright 2008 MontaVista Software, Inc.
+ * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com>
+ * Copyright 2015 Jonas Gorski <jogo@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/bug.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/log2.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/mod_devicetable.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_gpio.h>
+
+static int bcm63xx_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
+{
+ char irq_name[7]; /* "gpioXX" */
+
+ sprintf(irq_name, "gpio%d", gpio);
+ return of_irq_get_byname(chip->of_node, irq_name);
+}
+
+static int bcm63xx_gpio_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *dat_r, *dirout_r;
+ void __iomem *dat;
+ void __iomem *dirout;
+ unsigned long sz;
+ int err;
+ struct gpio_chip *gc;
+ struct bgpio_pdata *pdata = dev_get_platdata(dev);
+
+ dirout_r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dat_r = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!dat_r || !dirout_r)
+ return -EINVAL;
+
+ if (resource_size(dat_r) != resource_size(dirout_r))
+ return -EINVAL;
+
+ sz = resource_size(dat_r);
+
+ dat = devm_ioremap_resource(dev, dat_r);
+ if (IS_ERR(dat))
+ return PTR_ERR(dat);
+
+ dirout = devm_ioremap_resource(dev, dirout_r);
+ if (IS_ERR(dirout))
+ return PTR_ERR(dirout);
+
+ gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
+ if (!gc)
+ return -ENOMEM;
+
+ err = bgpio_init(gc, dev, sz, dat, NULL, NULL, dirout, NULL,
+ BGPIOF_BIG_ENDIAN_BYTE_ORDER);
+ if (err)
+ return err;
+
+ platform_set_drvdata(pdev, gc);
+
+ if (dev->of_node) {
+ int id = of_alias_get_id(dev->of_node, "gpio");
+ u32 ngpios;
+
+ if (id >= 0)
+ gc->label = devm_kasprintf(dev, GFP_KERNEL,
+ "bcm63xx-gpio.%d", id);
+
+ if (!of_property_read_u32(dev->of_node, "ngpios", &ngpios))
+ gc->ngpio = ngpios;
+
+ if (of_get_property(dev->of_node, "interrupt-names", NULL))
+ gc->to_irq = bcm63xx_gpio_to_irq;
+
+ } else if (pdata) {
+ gc->base = pdata->base;
+ if (pdata->ngpio > 0)
+ gc->ngpio = pdata->ngpio;
+ }
+
+ return gpiochip_add(gc);
+}
+
+static int bcm63xx_gpio_remove(struct platform_device *pdev)
+{
+ struct gpio_chip *gc = platform_get_drvdata(pdev);
+
+ gpiochip_remove(gc);
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static struct of_device_id bcm63xx_gpio_of_match[] = {
+ { .compatible = "brcm,bcm6345-gpio" },
+ { },
+};
+#endif
+
+static struct platform_driver bcm63xx_gpio_driver = {
+ .probe = bcm63xx_gpio_probe,
+ .remove = bcm63xx_gpio_remove,
+ .driver = {
+ .name = "bcm63xx-gpio",
+ .of_match_table = of_match_ptr(bcm63xx_gpio_of_match),
+ },
+};
+
+module_platform_driver(bcm63xx_gpio_driver);
+
+MODULE_DESCRIPTION("Driver for BCM63XX memory-mapped GPIO controllers");
+MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
+MODULE_LICENSE("GPL");
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